Electrothermostatic heat-regulator.



BEST AVAiLABLE COP\ L. G. GOPEMAN. ELEGTROTHERMOSTATIG HEAT REGULATOR.

APPLIIOATHON FILED OUT. 1, 19 8. I

Patented Aug. 31, 1909.

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BEST AVAMBLE COP.

UNITED STATES PATENT OFFICE.

LLOYD GROFF COPEMAN, OF BERKELEY, CALIFORNIA.

ELECTROTHERMOSTATIC HEAT-RE GULA'IOR.

To all whom it may concern:

Be it known that I, LLoYn G. COPEMAN, citizen of the United States,residing at Berkeley, in the county of Alanieda and State of California,have invented new and useful Improvements in IlllectrothermostaticHeat-Regulators, of which the following is a specification.

This invention relates to electro thermostatic heat regulators orcircuit controllers, which may be employed in conjunction withelectrically heated laundry apparatus of any character, soldering irons,and similar devices, and has for its object a means for controlling thesupply of electrical energy to the heater, by means of a thermostatlocated within the heat zone of the part to be regulated, and out ofcontact therewith.

It consists in a combination of parts, and in details of constructionwhich will be more fully explained by reference to the accompanyingdrawings, in which- Figure 1 is an elevation and partial sectionillustrating my apparatus. Fig. 2 is a transverse section. Fig. 3 is anenlarged view of the thermostat.

In many forms of electrically heated apparatus, the part to be heatedmay be rotary or movable in such a manner that it is not possible toconnect the controlling thermostat directly with the part.

I t is the object of my invention to provide a thermostat, and means bywhich it can be located within the heat zone of the part to be heated.and thus be so actuated as to control the heating current through theproper connections.

I have here illustrated my invention as applied to a revolving,cylindrical, laundry polishing iron A, which illustrates the applicationof my invention. This cylinder is centrally journaled and revoluble, andoperates in conjunction with a cylinder 2, between which and thecylinder A, the articles to be polished are passed. The cylinder Aprovided with the proper resistance coils, located within it, asindicated at 3, and these coils are supplied with an electrical currentthrough the wires l connecting a suitable source of electrical energywith the resistance coils. is here shown these wires are carried throughthe central hollow shaft 5 of the cylinder A, and the current isdistributed through the resistance coils as shown in Fig. 1.

The heating circuit is controlled by an Specification of Letters Patent.

Application filed October 1, 1908.

Patented Aug. 31, 1909.

Serial No. 455,751.

elcctro magnetically operated switch, through a shunt circuit connectedwith the main line. This switch is here shown in the form of a solenoid(3 having a movable core or armature 7, and this has connected with it,the fork or yoke 8.

9 are mercury-containing cups, or equivalent contact with which the endsof the fork 8 may be brought into contact, and when so connected, theheating circuit will be opened through the connections, as shown at 10.

The thermostat consists of elastic plates 11, the ends of which arefixed in slots or channels, or equivalent securing means, in a holder12, as clearly shown in Fig. 3, and insulated. These plates 11 areconcaved toward each other from the ends, said ends being most widelyseparated, and the central portions approaching.

The conducting wires 13 have their ends connected with the plates 11,and under ordinary conditions there being no contact between the plates11, the circuit is open, and the solenoid 6 remains denergized. As soonas the heat rises to a point where it is desired to cut it off, theexpansion of the plates 11 will cause the central portions to approacheach other until they form contact at 1%. This closes the circuitthrough the wires 13, and the solenoid 6, thus energizing the latter,and acting through its armature, it raises the yoke 8 and interrupts thecircuit through the cups 9, and this acting through the mechanism 10cuts off the heating circuit, thus preventing any further increase inthe temperature of the part A. As soon as the temperature has fallensufiiciently, the contraction of the plates 11 will cause them toseparate at the point 14, thus interrupting the circuit through thewires 13 and the solenoid 6, and the contacts 8 and 9 will be againcompleted, and the heating circuit reestablished.

In order to properly operate this device, it is necessary to locate thethermostat Within the heat zone of the part A. As this part is movable,it will not be possible to connec the thermostat directly therewith, Ihave therefore shown the thermostat as fixed within a shield 16 which ismounted above the revolving cylinder A, and has a raised chamber orreceptacle formed at 17 within which the thermostat 12 is contained. Thechamber being open at the lower part, and in close proximity with thepart A, the heat of the latter acts directly upon the contained BESTAVAELABLE 6GP":

thermostat, and in such a manner that the variations in temperaturewill. be promptly transmitted to this thermostat.

Having thus described my invention, what I claim and desire to secure byLetters Patent is-- 1. In an apparatus of the character described, anelectrical heater, a cut-out in the main circuit, an auxiliary or shuntcircuit, a thcrmo circuit closer interposed in the auxiliary circuitindependent of and exterior to the heat zone ofthe heater, a stationaryhood arranged proximate to the heater having a depressed chamber, andthermostat in said chamber fixed to the inner wall thereof and exposeddirectly to the heat radiating from the heater.

2. In an apparatus of the character described, a movable heater providedwith resistance coils, and a main electrical heating circuit connectedtherewith, a hood partially inclosing said heater, a thermostat fixed tothe inner wall of the hood and exposed directly to the heat radiatingfrom the heater, said thermostat being fixed with relation to themovable heater and located within the heat Zone thereof, an auxiliary orshunt circuit by which the heating circuit is controlled, andconnections between the thermostat and said auxiliary controller wherebythe main heating circuit is opened or closed.

3. In an apparatus of the character described, an electrical heater, amain electrical circuit, an auxiliary or shunt circuit through which themain circuit is opened or closed, a thermostat located within the heatzone of the electrical heater, and a hood arranged proximate to theheater having a depressed chamber in Which the thermostat is arranged soas to be exposed. directly to the heat radi- 1 of contact therewith, astationary hood parr tially inclosing the heater and having a depressedchamber in which the thermostat is placed in such manner as to bedirectly exposed to the heat radiating from said heater, an auxiliary orshunt circuit, a solenoid through Which said shunt circuit is connected,means for opening and closing the main circuit, said means controlled bythe solenoid, and connections between the shunt circuit and thethermostat.

5. In an apparatus of the character described, a movable electricalheater with interior resistances and a main heat circuit, a. hood infixed relation with the heater, a thermostat located Within the hood andthe heat Zone of the heater, a shunt circuit controlling the main heatcircuit, and connections between the thermostat and said shunt circuit.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

LLOYD GEOFF COPEMAN.

Witnesses LLoYn E. GANDY, CHARLES A. PENFIELD.

